updates

Author: foss-v

exercises/01_intro/01_syntax/src/lib.rs

@@ -16,4 +16,4 @@ mod tests {
     fn case() {
         assert_eq!(compute(1, 2), 5);
     }
-}
+}

exercises/02_basic_calculator/02_variables/src/lib.rs

@@ -10,7 +10,7 @@ pub fn speed(start: u32, end: u32, time_elapsed: u32) -> u32 {
     //  Do you need to annotate the type of `distance`? Why or why not?
 
     let distance = end - start;
-    
+
     // Don't change the line below
     distance / time_elapsed
 }

exercises/02_basic_calculator/03_if_else/src/lib.rs

@@ -1,6 +1,10 @@
 /// Return `true` if `n` is even, `false` otherwise.
 fn is_even(n: u32) -> bool {
-    todo!()
+    if n % 2 == 0 {
+        true
+    } else {
+        false
+    }
 }
 
 #[cfg(test)]

exercises/02_basic_calculator/04_panics/src/lib.rs

@@ -3,6 +3,10 @@
 fn speed(start: u32, end: u32, time_elapsed: u32) -> u32 {
     // TODO: Panic with a custom message if `time_elapsed` is 0
 
+    if time_elapsed == 0 {
+        panic!("The journey took no time at all, that's impossible!")
+    }
+
     (end - start) / time_elapsed
 }
 

exercises/02_basic_calculator/05_factorial/src/lib.rs

@@ -10,6 +10,14 @@
 //
 // Use only what you learned! No loops yet, so you'll have to use recursion!
 
+fn factorial(n: u32) -> u32 {
+    if n == 0 {
+        1
+    } else {
+        n * factorial(n - 1)
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use crate::factorial;